Recognition‐improved monolayer formation on air‐water interface

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Abstract
Molecular recognition mechanism was introduced into the monolayer formation of two barbituric derivatives, B1 and B2. on a series of melamine derivatives containing water subphase. The recognition pattern was found that each barbituric(or melamine) group forms 3‐fold H‐bonds on its two edges, respectively, with two of its neighboring melamine(barbituric) cores in the ratio of 1:1 on air‐water interface. The area per molecule in this pattern is about 60–65 Å2 for both B1 and B2. Such recognition improves the monolayer formation of B1 by increasing the collapse pressure around 20 mN/M and modulates the intermolecular distance of B2 in monolayer These effects should be quite meaningful for both theoretical research and practical application of Langmuir‐Blodgett films, especially.